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下载和显示PNG图片

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.*;

import java.io.*;

public class ViewPng extends MIDlet implements CommandListener

{

PRivate Display display;

private TextBox tbMain;

private Form fmViewPng;

private Command cmExit;

private Command cmView;

private Command cmBack;

public ViewPng()

{

display = Display.getDisplay(this);

// Create the Main textbox with a maximum of 75 characters

tbMain = new TextBox("Enter url", "/code/UploadFiles_1700/200605/20060519104731935.png", 75, 0);

// Create commands and add to textbox

cmExit = new Command("Exit", Command.EXIT, 1);

cmView = new Command("View", Command.SCREEN, 2);

tbMain.addCommand(cmExit);

tbMain.addCommand(cmView );

// Set up a listener for textbox

tbMain.setCommandListener(this);

// Create the form that will hold the png image

fmViewPng = new Form("");

// Create commands and add to form

cmBack = new Command("Back", Command.BACK, 1);

fmViewPng.addCommand(cmBack);

// Set up a listener for form

fmViewPng.setCommandListener(this);

}

public void startApp()

{

display.setCurrent(tbMain);

}

public void pauseApp()

{ }

public void destroyApp(boolean unconditional)

{ }

/*--------------------------------------------------

* Process events

*-------------------------------------------------*/

public void commandAction(Command c, Displayable s)

{

// If the Command button pressed was "Exit"

if (c == cmExit)

{

destroyApp(false);

notifyDestroyed();

}

else if (c == cmView)

{

// Download image and place on the form

try

{

Image im;

if ((im = getImage(tbMain.getString())) != null)

{

ImageItem ii = new ImageItem(null, im, ImageItem.LAYOUT_DEFAULT, null);

// If there is already an image, set (replace) it

if (fmViewPng.size() != 0)

fmViewPng.set(0, ii);

else // Append the image to the empty form

fmViewPng.append(ii);

}

else

fmViewPng.append("UnsUCcessful download.");

// Display the form with the image

display.setCurrent(fmViewPng);

}

catch (Exception e)

{

System.err.println("Msg: " + e.toString());

}

}

else if (c == cmBack) {

display.setCurrent(tbMain);

}

}

/*--------------------------------------------------

* Open connection and download png into a byte array.

*-------------------------------------------------*/

private Image getImage(String url) throws IOException

{

ContentConnection connection = (ContentConnection) Connector.open(url);

// * There is a bug in MIDP 1.0.3 in which read() sometimes returns

// an invalid length. To work around this, I have changed the

// stream to DataInputStream and called readFully() instead of read()

// InputStream iStrm = connection.openInputStream();

DataInputStream iStrm = connection.openDataInputStream();

ByteArrayOutputStream bStrm = null;

Image im = null;

try

{

// ContentConnection includes a length method

byte imageData[];

int length = (int) connection.getLength();

if (length != -1)

{

imageData = new byte[length];

// Read the png into an array

// iStrm.read(imageData);

iStrm.readFully(imageData);

}

else // Length not available...

{

bStrm = new ByteArrayOutputStream();

int ch;

while ((ch = iStrm.read()) != -1)

bStrm.write(ch);

imageData = bStrm.toByteArray();

bStrm.close();

}

// Create the image from the byte array

im = Image.createImage(imageData, 0, imageData.length);

}

finally

{

// Clean up

if (iStrm != null)

iStrm.close();

if (connection != null)

connection.close();

if (bStrm != null)

bStrm.close();

}

return (im == null ? null : im);

}

}

(出处:http://www.knowsky.com)

 
 
 
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